1984 Volvo 244 GL huge bog problem.

Old Jul 4, 2023 | 05:40 PM
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Default 1984 Volvo 244 GL huge bog problem.

I started having bogs here and there about 2 months ago, like once I get off the high way and stop, on take off it would bog a little bit, I changed both fuel pumps both filters, new plugs and a new O2 sensor 4 months ago, along with other things 2 years ago, it has gotten so bad it bogs down when I'm driving I can't go anywhere, it stalls here and there but it idles fine, and I noticed when i first start it and drive before it warms up completely it's fine after it gets warm it starts having this issue, I changed the MAF and still didn't help I checked for vacuum leaks and can't find any, I really don't know what to do at this point.
 
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Old Jul 4, 2023 | 06:42 PM
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Have you checked fuel pressure when you are having the problem? Perhaps connecting a fuel pressure gauge and just leaving it while driving around until you have a problem?

(a new O2 sensor would not have helped your problem - you can however disconnect the O2 sensor and continue to drive the car. The O2 sensor can change the mixture very little - )

Or - the temp sensor for the fuel injection system might be a problem. I would often find those melted after an overheating event. And certainly after these xx years that engine has had at least a few.

Have you measured what the temp sensor is telling the Fuel injection computer? ( it's not the single wire sensor somewhat close to the thermostat on the block, it's a two wire sensor near intake runner #3)
 
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Old Jul 4, 2023 | 06:57 PM
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Originally Posted by hoonk
Have you checked fuel pressure when you are having the problem? Perhaps connecting a fuel pressure gauge and just leaving it while driving around until you have a problem?

(a new O2 sensor would not have helped your problem - you can however disconnect the O2 sensor and continue to drive the car. The O2 sensor can change the mixture very little - )

Or - the temp sensor for the fuel injection system might be a problem. I would often find those melted after an overheating event. And certainly after these xx years that engine has had at least a few.

Have you measured what the temp sensor is telling the Fuel injection computer? ( it's not the single wire sensor somewhat close to the thermostat on the block, it's a two wire sensor near intake runner #3)
​​​​​​ Intake runner? The intake manifold?
 
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Old Jul 4, 2023 | 07:59 PM
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Originally Posted by Sulaymaan
​​​​​​ Intake runner? The intake manifold?
Yes the aluminum intake manifold, splits and is bolted with 2 bolts into each port on the head. Near the #3 intake port/runner - underneath is the temp sensor for the fuel injection. Blue or black plastic (depending on the year) - that tells the injection system what the temp of the engine is. They commonly melt after an overheating event -
 
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